Skiing is one of the best family vacations ever. The only downside is that this beloved sport is expensive. Once you add in lessons, lodging, equipment, and tickets, skiing becomes cost prohibitive for families. Fortunately, family-friendly ski resorts are plentiful and many are doing their best to take the sting out of the cost by offering 'kids ski free' deals. At some resorts, this perk is just for very young children so the benefit is short-lived. While at others like Keystone Resort, Steamboat, Mt. Bachelor, Killington, and Sun Valley, school-age kids get a big break too.